Core machine



April 24, 1934. F. McS. THOMAS 1,956,232

CORE MACHINE Filed Jan. 27, 1933 2 Sheets-Sheet l 34 27 JV '7 20 i A? 5" S?" Q 20 35 2.9 n

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April 24, 1934. F. M08. THOMAS CORE MACHINE Filed Jan. 27, 1933 2 Sheets-Sheet 2 Ame/whom can]: JW JI T Izomas,

Patented Apr. 24, 1934 UNETED STATES PATENT OFFICE Warren Foundry and Pipe Corporation,

Phillipsburg, N. J., a corporation of Delaware Application January 27, 1933, Serial No. 653,897

8 Claims.

This invention relates toimprovements in machines for forming head cores and more particularly to improvements in machines for compressing core-forming material into molds designed to make head cores which are utilized in the formation of the bell or socket end of pipes.

Head cores of this type have in one end an axial scruff receiving pocket and at the other an external rib. They are formed in a mold having an opening in the top of an area corresponding to that of the cross section of the pocket, and having a coaxial annular recess at the opposite end to form the above mentioned external rib on the core. In shaping the core, the core-forming material, composed of oil and sand, for instance, is fed into the mold and spread radially into the annular recess and against the sides. Heretofore it has been found difiicult to pack sand to sufficient hardness into the annular recess.

An object of the present invention is to provide an improved power-operated mechanism which will satisfactorily and efficiently shape the core, and which, by means of a positive compressing member, sweeps and packs the same into the annular recess to produce a core of the desired density and hardness.

With this and other objects and advantages in view, the invention will now be described by reference to the accompanying drawings in which Figure 1 is a side elevational view of the improved machine with parts in section;

Fig. 2 is a vertical cross sectional view showing one modification of core shaping members lowered into the opening of a mold;

Fig. 3 is a cross sectional View on line 33 of Fig. 2 in the direction of the arrows;

Fig. 4 is a cross sectional view on line 4-4 of Fig. 1;

' Figs. 5 and 6 are cross sectional views on lines 5-5 and 6-6 respectively of Fig. 1;

Fig. '7 is a cross sectional view on line '7-7 of Fig. 8 is a detail plan view of the member for compressing sand into the annular recess of the mold;

Fig. 9 is a vertical sectional view of another modification of core shaping members;

Fig. 10 is a detail top View of the core sweep or strike head shown in Fig. 9; and

Fig. 11 is a detail rear view of the core sweep or strike'head shown in Fig. 9.

Referring to Fig. 1, the machine shown comprises a hollow spindle 1 supported in a vertical position by a frame 2; a strike head or so-called core sweep 3 connected to the lower end of the spindle 1; a rod 4, preferably hollow, arranged coaxially with the spindle 1; a compressing finger 5 adjacent the core sweep 3 and connected to the lower end of the rod 4 by means of a link 6; and means for raising and lowering, and for rotating the rod 4 and the spindle 1.

A laterally extending table 7 is provided for supporting the mold. A mold 8 is shown with the core sweep 3 lowered through its opening 9. The lower end of the mold 8 is provided with an annular recess 10, and when the core is being shaped, this recess is coaxially arranged with the rod 4 and the spindle 1. The mold 8 is positioned on a core plate 11 which rests on a base plate 12, and comprises sections which can readily be separated and removed from the finished core.

The core sweep 3 is pinned or otherwise secured to the spindle 1, Whlch is designed to be rotated by a pulley or other means, which is mounted on a shaft 13 having a bevel gear connection 14 with the spindle 1. A loose pulley 15 and a fast pulley 16 are shown mounted on the shaft 13. A rod 17 having a handle 18 at one end and embracing a belt 19 at the other, is provided for shifting the belt from one pulley to the other to thereby rotate the spindle or to stop the rotation thereof at will. The spindle 1 is slidably mounted in the bearings 20. A counterweight lever 21 is pivotally connected to the frame 2 at 22 and is also pivotally and rotatably connected to the upper end of the spindle 1 at 23 by a loose collar 23. A rod. 24 having a handle 25 is provided for operating the lever 21 at one end, the fulcrum being at 22. Positioned adjacent the other end of the lever 21 is a counterweight 26. By raising or lowering the handle 25, the spindle is correspondingly raised or lowered. An adjustable split collar 2'7 is provided to determine the desired position of the core sweep in the mold when the packing operation is begun. A second adjustable split collar 27' is provided above the collar 23' to prevent slippage thereof when the spindle is being raised.

The rod 4 which operates the fingers 5 is movable longitudinally within the spindle' 1, and is mounted to permit vertical movement thereof Within the hollow spindle 1 and independently of the spindle. The spindle is keyed by means of a feather key 30 to means rotatable by the bevel gears 14. In this instance, the spindle l is keyed to the hub of the horizontally disposed gear 14.

A keyway 29 is provided in the spindle 1. A portion of the wall of the spindle is therefore thickened, as shown, to reenforce the same. By

means of the construction shown, the spindle can be raised and lowered, as well as rotated. Upon driving the pulley 16, the spindle 1 and the attached strike head 3 are rotated. Rotation of the strike head results in the rotation of the finger 5, the latter being pushed by the strike head.

A counterweight lever 31 is pivotally connected to the frame 2 at 32 and is also pivotally and rotatively connected to the end of the rod 4 at 33 by a loose collar 33'. A rod 34 having a handle 35 positioned adjacent the handle 25, is provided for operating the lever 31 at one end, the fulcrum being at 32. Positioned adjacent the other end of the lever 31 are counterweights 36. By raising or lowering the handle 35, the finger 5 is swung respectively out of or into operative position. An adjustable split collar 37 limits the downward movement of the rod 4 and determines the position of the finger 5 in the annular recess 10 in the mold 8. An adjustable split collar 37' is positioned on the rod 4 above the collar 33' to prevent the latter from the slipping off the rod.

The core sweep, views of which are shown in Figs. 2 and 9 to 11, is of the usual type contoured to form a scruff receiving pocket 38 (Fig. 2), except that a cutout portion 39 is provided in the sweep 3 into which the finger 5 is drawn when in inoperative position, as shown in Fig. 2. Or, as shown in Figs. 9 to 11, the compressing finger or packing arm 40, when drawn up into inoperative position, is held adjacent the core sweep 41 and is guided by a guide member 42 projecting from an inner side of the core sweep. The member 42 assists in preventing the angular displacement of the finger, that is likely to occur on account of the tangential drag of the sand.

The compressing finger may be of any desired shape suitable for swinging its end into and out of the annular recess 10 of the mold 8, as shown in Figs. 2 and 9. An open driving ring 43, a plan view of which is shown in Fig. 3, having openings 44, 45 and 46, is positioned horizontally just above the core sweep and is affixed to the spindle 1. In Fig. 2 the finger 5 is shown pivotally connected to the ring at 4'7 and in Fig. 9 the finger 40 is pivoted at 48. In the modification shown the end of the compressing finger describes an arc of a circle in a vertical plane when brought into or out of operation.

The compressing fingers may be provided at the compressing end with a removable ramming shoe 49 (Figs. 2, 8 and 9) adapted to be attached to a finger by means of a bolt 50. The outer side of the shoe 49 is shaped to provide a cam-like action when the finger is in operation thereby obtroduced into the mold, the belt 19 shifted to the fast pulley 16 by pulling the handle 13, and the sweep 3 lowered into the mold by pulling downwardly on the handle 25. The finger 5 is thenbrought into operative position by pulling downwardly on the handle 35 as far as it will go. The finger 5, preferably provided with a shoe 0 49, which is now rotating in the recess 10, packs the sand into the recess. As the sand accumulates under the shoe 49, the finger is forced towards the center, thereby raising the rod 4 and handle 35 against any downward pressure which is applied to the handle 35.

When the sand has been packed in sufficient quantities in the recess 10, and the proper hardness has been imparted thereto, the handle 35 is released and the counterweights 36 raise the finger 5 and shoe 49 radially toward the center and out of the way.

More sand is then introduced into the mold through the open driving ring 43. The openings 44, 45 and 46 are provided so as to make it unnecessary to remove the sweep 3 from the mold in order to introduce more sand. The sweep 3 then packs the sand, thus introduced, into the bottom and sides of the mold. The inside shape of the pocket left by the sweep is determined by the contour of the outer surface of the sweep.

As the core sweep 3 revolves, excess sand is squeezed out of the top of the mold. The sweep is then raised out of the mold by pushing upwardly on the handle 25. The mold 8 is opened and the core removed.

By means of my machine the sweep is handled without stopping the machine and without endangering the operation. The core, particularly the portion forming the annular rib, is packed to any desired hardness depending upon the force applied to the handle 35.

The invention has been disclosed herein for illustrative purposes in its preferred embodiment, but it is understood that the scope of the invention is defined by the appended claims rather than by the foregoing description.

I claim:

1. A device for forming a head core having in one end an axial scruff receiving pocket, and at the other an external annular rib, including a mold having an opening in its top of an area corresponding to that of the cross section of the pocket, and a coaxial annular recess at the opposite end to form a rib, means movable through the opening to shape the pocket and to displace molding sand radially and compress it in the recess when said means is rotated with respect to the mold, said means including a strike head contoured to form the pocket, a cut-out portion in the said strike head, a compressing finger slidable in and out of the cut-out portion in the said strike head, means for normally holding the finger in said cut-out portion in inoperative position, the said finger when fully drawn into said' inoperative position having substantially no parts projecting from the said cut-out portion into the said mold and means for forcing the finger out of said cut-out portion in operative position for compressing the molding sand in the said recess.

2. A device for forming a head core having an annular rib at one end and an axial scrufi receiving pocket at the other, including a mold having an opening in its top of an area corresponding to that of the cross section of the pocket,

and a coaxial annular recess at the opposite end to form the rib, a strike head movable through the opening and contoured to form the pocket when rotated, a hollow spindle connected to the strike head and extending upwardly therefrom, means for rotating the spindle and strike head, a compressing finger mounted adjacent the said strike head, a rod extending through said spindle and connected to the finger for actuating the same to bring it into inoperative position by raising the rod and into operative position for compressing the molding sand in the said recess by lowering the said rod.

3. A device for forming a head core having an annular rib at one end and an axial scruff receiving pocket at the other, including a mold having an opening in its top of an area corresponding to that of the cross section of the pocket, and a coaxial annular recess at the opposite end to form the rib, a strike head movable through the opening and contoured to form the pocket when rotated, a hollow spindle connected to the strike head and extending upwardly from the strike head, means for rotating the spindle and strike head with respect to the mold, means including a counterbalance for raising the spindle and strike head upwardly away from the mold, a compressing finger mounted adjacent the said strike head for displacing molding sand radially and for compressing it in the recess when said strike head is rotated with respect to the mold, a rod connected to the compressing finger and extending upwardly through the spindle, means including a counterbalance for raising the rod and the finger in inoperative position, and manually operative means for independently lowering the strike head and the finger into operative position for compressing the sand in the mold.

4. A device for forming head cores, comprising a vertical hollow spindle, a strike head connected to the lower end of the spindle, an open driving ring positioned horizontally above the strike head, a compressing finger adjacent the strike head and pivoted on the said ring, and operating means for the said compressing finger arranged coaxially with the vertical spindle.

5. In a device for forming head cores, a vertical hollow spindle, a strike head connected to the lower end of the spindle, a rod arranged coaxially with the vertical spindle, a compressing finger adjacent the strike head and connected to the lower end of the rod, the said vertical spindle and the said rod being rotatable, and the said spindle and rod being movable longitudinally with respect to each other.

6. In a device for forming head cores, a vertical hollow spindle, a strike head connected to the lower end of the spindle, a compressing finger adjacent the strike head, finger operating means arranged coaxially with the vertical spindle and connected to the compressing finger for operating the latter by vertical longitudinal movement of the said finger operating means, means for raising and lowering the said finger operating means, means for raising and lowering the spindle, and counterweights cooperating with the said raising and lowering means, the finger and finger operating means being overbalanced by a counterweight which tends to withdraw the finger from operative position.

7. A device for forming a head core having in one end an axial scruff receiving pocket, and at the other an external annular rib, including a mold having an opening in its top of an area corresponding to that of the cross section of the pocket, and a coaxial annular recess at the opposite end to form a rib, means movable through the opening to shape the pocket and to displace molding sand radially and compress it in the recess when said means is rotated with respect to the mold, said means including a strike head contoured to form the pocket, a compressing finger adjacent the strike head, and means for maintaining pressure on sand with said finger in the 100 mold at any point in the path of the free end of the finger between the said recess and the strike head and for advancng and withdrawing the said free end of the finger by a single movement.

8. A device for forming a head core having in 105 one end an axial scruff receiving pocket, and at the other an external annular rib, including a mold having an opening in its top of an area corresponding to that of the cross section of the pocket, and a coaxial annular recess at the op- 110 posite end to form a rib, means movable through the opening to shape the pocket and to displacemolding sand radially and compress it in the recess when said means is rotated with respect to the mold, said means including a strike head con- 1 5 toured to form the pocket, a compressing finger adjacent the strike head, and means for maintaining pressure on sand with said finger in the mold at any point in the path of the free end of the finger between the said recess and the strike 12 head and for advancing and withdrawing the said free end of the finger by a single movement describing an arc of a circle in a vertical plane.

FRANK MoS. THOMAS]. 

